.banner-img {
  width: 100%;
}
section {
  background: $c1;
  margin-top: 12px;
  h4 {
    color: white;
    padding: 12px;
    border-bottom: 1px solid #e5e5e5;
  }
}

$space: 6px;

.exchange-ul,
.product-ul {
  background: white;
  display: flex;
  flex-wrap: wrap;
  padding: 6px;
  .exchange-li {
    background: white;
    flex-basis: calc(33.33% - #{$space * 2});
    margin: $space;
    text-align: center;
  }
  .product-li {
    background: white;
    flex-basis: calc(20% - #{$space * 2});
    margin: $space;
    text-align: center;
    overflow: hidden;
  }
}
